US4651421A - Cutterhead for a vegetation cutter - Google Patents

Cutterhead for a vegetation cutter Download PDF

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Publication number
US4651421A
US4651421A US06/824,149 US82414986A US4651421A US 4651421 A US4651421 A US 4651421A US 82414986 A US82414986 A US 82414986A US 4651421 A US4651421 A US 4651421A
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US
United States
Prior art keywords
cutterhead
coupling members
housing
coupling
cams
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US06/824,149
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English (en)
Inventor
Gerhard Zerrer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Andreas Stihl AG and Co KG
Original Assignee
Andreas Stihl AG and Co KG
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Filing date
Publication date
Application filed by Andreas Stihl AG and Co KG filed Critical Andreas Stihl AG and Co KG
Assigned to ANDREAS STIHL, A CORP OF GERMANY reassignment ANDREAS STIHL, A CORP OF GERMANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ZERRER, GERHARD
Application granted granted Critical
Publication of US4651421A publication Critical patent/US4651421A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D34/00—Mowers; Mowing apparatus of harvesters
    • A01D34/01—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
    • A01D34/412—Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
    • A01D34/416—Flexible line cutters
    • A01D34/4161—Means for feeding cutter line
    • A01D34/4162—Means for feeding cutter line automatically

Definitions

  • the invention relates to a cutterhead for a motor-driven vegetation cutter.
  • the cutterhead has a rotatable housing and a spool journalled in the housing.
  • the spool holds a cutting filament wound thereon and includes cams mounted thereon.
  • the cutterhead also has at least two spring-loaded coupling members corresponding to the cams and journalled so that they are displaceable in dependence upon centrifugal force to incrementally unwind the cutting filament.
  • opposed coupling members configured as sliders are provided in a rotatably mounted casing and are each biased by a helical spring; at a predetermined centrifugal force, the sliders slide outwardly counter to the force of the springs. This releases the coupling connection between the sliders and the cams on the spool so that the spool can rotate to feed out the cutting filament to some extent.
  • the helical springs force the sliders back into their initial position, so that one of the cams abuts the slider thereby fixing the spool.
  • the cutting filament can be fed out again only after the predetermined centrifugal force is reached in response to the cutting filament becoming shorter due to wear whereupon the sliders slide outwardly to again unlatch the spool.
  • a substantial disadvantage is that the sliders, guided linearly, come into action independently of one another in order to release the spool in dependence upon centrifugal force. If in fact one of the two sliders does not shift synchronously with the other slider, for instance because it has become soiled and the friction on the two sliders differs, then either the detent coupling does not index at all, or the spool is permanently released thereby allowing the cutting filament to unreel freely.
  • the known cutterhead is therefore quite vulnerable to malfunctioning as a function of the varying friction of the two sliders in their guideways. This cutterhead is also expensive to manufacture because the parts must be very accurately configured and guided.
  • a single pivotable lever is provided on the housing.
  • This lever is somewhat similar to the swinging of a spring clockwork and has two stops, which cooperate in alternation with cams of the spool that rest tightly beside one another like toothed rings.
  • the cutting filament does not always assume an exactly horizontal position; instead, it may extend obliquely either upwardly or downwardly, depending on the resistances encountered during cutting.
  • centrifugal force components of various magnitudes in the vertical direction which can have an uncontrollable effect on readjustment. It may even happen that when the balls begin to move upwardly, a premature and unintentional resonance buildup due to unpredictable vertical centrifugal force components may bring about the triggering or lowering operation, resulting in a continuous adjustment regardless of the rotational speed.
  • this object is attained by providing that coupling members, each pivotably mounted on a journal, are coupled together and are synchronously displaceable via an intermediate ring that is journalled on the housing so as to be freely rotatable with respect to the latter.
  • FIG. 1 is a sectional view of an embodiment of a cutterhead according to the invention
  • FIG. 2 is another view into the interior of the cutterhead of FIG. 1 showing the coupling members thereof in the rest position;
  • FIG. 3 is a view similar to FIG. 2, but with the coupling members located in the outwardly pivoted position in response to centrifugal force.
  • the cutterhead 1 shown in the drawing is part of a vegetation cutter, not shown in further detail, which is preferably used for cutting grasses and the like.
  • the cutterhead 1 is driven by a motor (not shown) of the vegetation cutter and, on being driven, the cutterhead rotates about the drive axis 2.
  • the cutterhead 1 has an approximately cup-shaped housing 3 having a hub 4 in its central region.
  • the housing 3 is closed off on the end thereof lying opposite to the base wall 5 by a lid 7 which threadably engages the housing by means of threads 6.
  • the hub 4 is provided with securing rings 34, 34' for securing a spool 8.
  • the spool 8 is provided in the housing 3 and is freely rotatably journalled on the peripheral surface 9 of the hub 4 so as to be coaxial with the drive axis 2.
  • a cutting filament 10 is wound on the spool 8.
  • the filament may, for example, be a Perlon filament or the like, and its free end portion 11 is guided to the outside through an opening 12 in the peripheral wall 13 of the housing 3. To reduce wear to a minimum, the opening 12 is located in a guide element 14 which is retained in the peripheral wall 13.
  • an intermediate ring 15 which is likewise freely rotatably journalled on the peripheral surface 9 of the hub 4 so as to be coaxial with the drive axis 2.
  • the bearing friction of the intermediate ring 15 is dimensioned to effect a certain amount of damping. If the structurally determined ratios of friction are insufficient for complete damping, an additional friction brake can be provided in a simple manner.
  • the additional friction brake can be, for example, in the form of a spring-loaded friction ring which presses directly upon the intermediate ring 15 and brakes the latter such that the intermediate ring 15 cannot be moved except in response to a somewhat higher displacing force.
  • the intermediate ring 15 rests with one end face on the inner surface of the base wall 5 and, on its other end face, it is mounted on the hub 4 via the securing ring 34 with a plate spring 16 provided therebetween as a damping member.
  • Two journalling mounts 17, 17' extend from the inner surface of the base wall 5 of the housing 3 and are diametrically opposite one another.
  • Coupling members 18, 18' are pivotally journalled on the two mounts 17, 17' and each coupling member is configured as a bell-crank lever or two-armed angle piece having a pivot arm 19 and a lever arm 20.
  • the angle between the pivot arm 19 and the lever arm 20 may advantageously be approximately 100° to 150°.
  • Each of the two coupling members 18, 18' has its own associated retaining spring 24, which is preferably in the form of a V-shaped leaf spring.
  • the retaining spring 24 is fixed on the housing 3 in that one leg 25 of the retaining spring 24 is supported in a form-fitting manner in a slit recess 26 of the housing 3.
  • the center of gravity 31 of each coupling member is located outside the pivot axis in the area between the journalling mounts 17, 17' and the free end of the pivot arm 19 on which a stop 32 is provided.
  • cams 33 On one end face of the spool 8, a total of seven cams 33 in the embodiment shown, are arranged on a circle at equal intervals from one another. It may also be desirable to provide five or ten cams 33, for example, instead of seven, on the spool 8. These cams 33 correspond with the stops 32 of the coupling members 18, 18'.
  • FIGS. 2 and 3 A closer look at FIGS. 2 and 3 shows that the two coupling members 18, 18' are configured somewhat differently from one another, in that the angle between the pivot arm 19 and the lever arm 20 is somewhat larger in the coupling member 18 than in the opposite coupling member 18'. As a result, the radial distance between the drive axis 2 and the stop 32 is greater for the coupling member 18 than for the other coupling member 18'.
  • the coupling members 18, 18' are shown in their non-pivoted rest positions.
  • FIG. 2 shows that the coupling member 18 is in a latching position with one of the cams 33 resting on the stop 32.
  • the opposite coupling member 18' is in its release position because the radial distance between the stop 32' thereof and the drive axis 2 is less than the radial distance between the cams 33 and the drive axis 2.
  • the coupling members 18, 18' are located in their positions in which they are swivelled open, and as this figure shows, the coupling member 18 has now assumed its release position, since the pivot arm 19 has been displaced as far as the peripheral wall 13 of the housing 3, so that the radial distance between the stop 32 and the drive axis 2 is greater than the radial distance between the cams 33 and the drive axis 2.
  • the stop 32' is now located in the circular path of the cams 33.
  • the coupling member 18' is thus in its locking position, and the radial distance between the stop 32' and the drive axis 2 is equal to the radial distance between the cams 33 and the drive axis 2.
  • the rotation of the housing 3 and spool 8 is effected by the drive provided via the drive shaft rotating about drive axis 2.
  • This rotation carries along the housing 3 and all the parts journalled therein such as the spool 8 and the intermediate ring 15. Since one cam 33 of the spool 8 is resting on the stop 32 of the coupling member 18 (FIG. 2), the spool 8 is latched in the housing 3.
  • the rotational speed of the cutterhead 1 increases, and the centrifugal force rises up to a predetermined level.
  • This level is determined by the magnitude of the weight of the coupling member and of the force of the retaining spring 24.
  • the coupling members 18, 18' which are held in the rest position by the retaining springs 24, move outwardly with their pivot arms 19, 19' because the center of gravity 31 is located outside of their pivot center defined by mounts 17, 17'.
  • the length of the extended cutting portion of the cutting filament 10 is readjusted by a predetermined amount.
  • the centrifugal force drops, and the effect of this, in turn, is that the retaining spring 24 presses the one coupling member 18 back into its initial position, so that in this rest position the stop 32 of the pivot arm 19 resumes its radially inwardly directed initial position and the tooth 22 of the coupling member 18, which has not moved out of the tooth gap 23 during the displacement, is returned to its original starting position (FIG. 2).
  • displacement travel can be arranged to suit given requirements by appropriately dimensioning the teeth 22, the tooth gaps 23 and the length of the pivot arms 19 as well as by appropriately arranging the stops 32, 32'.
  • both coupling members 18, 18' are advantageously configured to be substantially symmetrical and are provided with a holding spring 24, 24'. Accordingly, it becomes possible at the same time for the so-called passive coupling member 18' to become an active coupling member, namely, whenever the coupling member 18, which is structurally designed to be the active member, should become inactive due to malfunction, for whatever reason. In this situation, the coupling member 18 is driven in coupled fashion by the now-activated coupling member 18' via the positive guidance of the intermediate ring 15 and is moved into the indexed positions described.
  • the essential advantage of the cutterhead 1 according to the invention is that there is positive guidance between two coupling members 18, 18' which obviates the need of matching these parts with particular accuracy because an exact synchronous movement of the two coupling members 18, 18' is always effected. Furthermore, the cutterhead 1 of the invention is substantially more reliable functionally, because if an active coupling member should fail the other coupling member is activated immediately, and so satisfactory functioning is always assured via the positive guidance provided in accordance with the invention. In addition, the cutterhead 1 according to the invention has no sensitively guided sliders; instead, the coupling members 18, 18' are exclusively provided for uncomplicated pivoting movements that are not vulnerable to malfunctioning. Malfunctions due to moisture, soiling and friction are thus largely precluded.
  • the cutterhead embodied according to the invention is particularly intended for use in brushcutters.
  • Such brushcutters are typically driven by a two-stroke motor with relatively high vibration, via rods.
  • other vibration and shocks are produced by the uneven engagement of the cutting filament.
  • the vibrations originating in the drive motor which are transmitted and built up via the structurally necessary drive axis or drive rod, together with the vibrations and shocks originating in the cutterhead, produce a resonance effect, which impairs the operation of the cutterhead as a whole and especially in that the feeding out of additional cutting filament then no longer takes place exactly in dependence upon the desired rotational speed.
  • the invention further provides that the spring/mass system, which is embodied by the cutterhead, is additionally damped.
  • This damping is effected in addition to the damping already existing in the cutterhead or in the system and provided as a result of inevitable friction.
  • This friction-conditioned damping is inadequate, because it is subject to considerable variation due to manufacturing tolerances as well as wear; thus, an accurately rpm-dependent damping based on existing friction ratios is not possible.
  • an additional friction brake is provided in the cutterhead, which prevents resonance buildup in the cutterhead and at the same time assures that the cutting filament is fed out only at a predetermined rotational speed.
  • the securing ring 34 is disposed so as to be not directly adjacent to the intermediate ring 15 and is instead spaced axially therefrom.
  • a plate spring 16 is provided between the securing ring 34 and the intermediate ring 15. This plate spring 16 is supported on the securing ring 34, which is seated on the hub 4, and rests resiliently and with friction on the intermediate ring 15.
  • a damping element in the form of the plate spring described, however, any other arrangement of damping members is also possible.

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  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Harvester Elements (AREA)
US06/824,149 1985-01-31 1986-01-30 Cutterhead for a vegetation cutter Expired - Lifetime US4651421A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853503237 DE3503237A1 (de) 1985-01-31 1985-01-31 Schneidkopf
DE3503237 1985-01-31

Publications (1)

Publication Number Publication Date
US4651421A true US4651421A (en) 1987-03-24

Family

ID=6261279

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/824,149 Expired - Lifetime US4651421A (en) 1985-01-31 1986-01-30 Cutterhead for a vegetation cutter

Country Status (8)

Country Link
US (1) US4651421A (de)
JP (1) JPH0640777B2 (de)
AU (1) AU577006B2 (de)
CA (1) CA1263029A (de)
DE (1) DE3503237A1 (de)
FR (1) FR2576743B1 (de)
GB (1) GB2170389B (de)
SE (1) SE456631B (de)

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4779405A (en) * 1987-05-01 1988-10-25 Piston Powered Products, Inc. Line-feeding head for a rotary line trimmer
FR2623364A1 (fr) * 1987-11-20 1989-05-26 Stihl Andreas Tete de coupe
US4893410A (en) * 1987-11-20 1990-01-16 Andreas Stihl Cutterhead for a vegetation cutter
US4926557A (en) * 1988-07-21 1990-05-22 Allegretti & Company Semi-automatic string trimmer head
US4989321A (en) * 1989-07-07 1991-02-05 Andreas Stihl Rotatably driven cutterhead for a vegetation cutting apparatus
US5020224A (en) * 1988-07-21 1991-06-04 White Consolidated Industries, Inc. Semi-automatic string trimmer head
US5036648A (en) * 1989-05-17 1991-08-06 Andreas Stihl Cutterhead for a vegetation cutter apparatus
US5060384A (en) * 1990-12-06 1991-10-29 Inertia Dynamics Corporation Automatic head for a line trimmer
US5063673A (en) * 1989-09-11 1991-11-12 Black & Decker Vegetation cutters
US5109607A (en) * 1990-10-12 1992-05-05 Inertia Dynamics Corporation Automatic line trimmer head
US5675897A (en) * 1996-05-01 1997-10-14 Berfield; Robert C. Rotary flail feeding device
US5743019A (en) * 1995-06-07 1998-04-28 Berfield; Robert C. Rotary flail feeding device and method
US5758424A (en) * 1996-08-23 1998-06-02 Iacona; Fernando R. Head for string trimmer
US6347455B2 (en) 1999-12-20 2002-02-19 Murray, Inc. String trimmer head
US6401344B1 (en) 1999-09-21 2002-06-11 Mark R. Moore Head for line trimming apparatus
US6446345B1 (en) * 1998-11-24 2002-09-10 Starting Industrial Co., Ltd. Rotary cutter for mower
EP1393611A1 (de) * 2002-08-26 2004-03-03 GARDENA Manufacturing GmbH Rotierender Schneidkopf, insbesondere für einen Rasentrimmer
US7111403B2 (en) 1999-09-21 2006-09-26 Moore Mark R Head for line trimming apparatus
WO2007032043A1 (en) 2005-09-13 2007-03-22 Arnetoli Motor Mower head with protection for a cutting cord
US20070214655A1 (en) * 2005-09-13 2007-09-20 Fabrizio Arnetoli Mowing head with peripheral members for engagement of the cutting line
US20080155837A1 (en) * 2007-01-03 2008-07-03 Moore Mark R Head for a rotary line trimmer apparatus
US20080282552A1 (en) * 2005-11-02 2008-11-20 Fabrizio Arnetoli Grass-Cutting Head with Spiral Guide Channels for the Cutting Line
US20130283752A1 (en) * 2012-03-19 2013-10-31 Robert Bosch Gmbh Line trimmer
US10034422B2 (en) 2016-06-14 2018-07-31 Black & Decker Inc. Cutting head for a string trimmer
US20180271010A1 (en) * 2015-10-08 2018-09-27 Husqvarna Ab Automatic line feed for trimmer
US10165727B2 (en) * 2015-02-16 2019-01-01 Tecomec S.R.L. Trimmer head

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4817288A (en) * 1986-03-25 1989-04-04 Daijo Hirose Cutting head for cord type mower
AU592679B2 (en) * 1987-10-28 1990-01-18 White Consolidated Industries, Inc. Apparatus for cutting vegetation
DE3916525A1 (de) * 1989-05-20 1990-11-22 Stihl Maschf Andreas Schneidkopf
DE69131326T2 (de) * 1990-10-12 1999-09-30 Ryobi Outdoor Products Inc Automatische zufuhr des schneidkopffadens
GB9110125D0 (en) * 1991-05-10 1991-07-03 Black & Decker Inc Improvements in or relating to vegetation cutters
JP6053042B2 (ja) * 2014-08-18 2016-12-27 株式会社ハートフル・ジャパン 刈払機のコード自動繰出し機構。
JP6440422B2 (ja) * 2014-09-17 2018-12-19 ダイアトップ株式会社 コード式刈払機用刈払ヘッド

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4104796A (en) * 1977-07-29 1978-08-08 Sheldon John D Filament-type trimmer
US4236309A (en) * 1978-02-27 1980-12-02 K & S Industries, Inc. Flexible line trimmer with line feeding apparatus
US4274201A (en) * 1978-02-13 1981-06-23 Berkley And Company, Inc. Rotary cutting assembly with filament feed
US4285127A (en) * 1978-06-28 1981-08-25 Andreas Stihl Apparatus for trimming plants
US4349962A (en) * 1980-06-14 1982-09-21 Komatsu Zenoah Co. Cutting down machine
US4426780A (en) * 1981-09-03 1984-01-24 The Toro Company Line metering apparatus
US4483069A (en) * 1979-08-01 1984-11-20 Emerson Electric Co. Apparatus for cutting vegetation
US4566189A (en) * 1983-10-15 1986-01-28 Goro Muto Filament-type trimming apparatus
US4584771A (en) * 1976-08-13 1986-04-29 The Toro Company Line metering apparatus

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE7905502L (sv) * 1978-06-28 1979-12-29 Stihl Maschf Andreas Vextskerningsredskap
DE2855990A1 (de) * 1978-12-23 1980-07-10 Stihl Maschf Andreas Pflanzenschneidgeraet
JPS5833849Y2 (ja) * 1978-08-18 1983-07-29 株式会社共立 刈払機の滑動接地円板装置
US4236312A (en) * 1979-02-16 1980-12-02 Emerson Electric Co. Apparatus for cutting vegetation
US4366622A (en) * 1979-06-29 1983-01-04 Emerson Electric Co. Apparatus for cutting vegetation
US4352243A (en) * 1980-03-21 1982-10-05 Emerson Electric Co. Apparatus for cutting vegetation
US4347666A (en) * 1980-07-25 1982-09-07 Emerson Electric Co. Apparatus for cutting vegetation

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4584771A (en) * 1976-08-13 1986-04-29 The Toro Company Line metering apparatus
US4104796A (en) * 1977-07-29 1978-08-08 Sheldon John D Filament-type trimmer
US4274201A (en) * 1978-02-13 1981-06-23 Berkley And Company, Inc. Rotary cutting assembly with filament feed
US4236309A (en) * 1978-02-27 1980-12-02 K & S Industries, Inc. Flexible line trimmer with line feeding apparatus
US4285127A (en) * 1978-06-28 1981-08-25 Andreas Stihl Apparatus for trimming plants
US4483069A (en) * 1979-08-01 1984-11-20 Emerson Electric Co. Apparatus for cutting vegetation
US4349962A (en) * 1980-06-14 1982-09-21 Komatsu Zenoah Co. Cutting down machine
US4349962B1 (en) * 1980-06-14 1995-05-02 Komatsu Zenosh Co Cutting down machine.
US4426780A (en) * 1981-09-03 1984-01-24 The Toro Company Line metering apparatus
US4566189A (en) * 1983-10-15 1986-01-28 Goro Muto Filament-type trimming apparatus

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4779405A (en) * 1987-05-01 1988-10-25 Piston Powered Products, Inc. Line-feeding head for a rotary line trimmer
FR2623364A1 (fr) * 1987-11-20 1989-05-26 Stihl Andreas Tete de coupe
US4866846A (en) * 1987-11-20 1989-09-19 Andreas Stihl Cutterhead for a vegetation cutter
US4893410A (en) * 1987-11-20 1990-01-16 Andreas Stihl Cutterhead for a vegetation cutter
US4926557A (en) * 1988-07-21 1990-05-22 Allegretti & Company Semi-automatic string trimmer head
US5020224A (en) * 1988-07-21 1991-06-04 White Consolidated Industries, Inc. Semi-automatic string trimmer head
DE3916009C5 (de) * 1989-05-17 2007-11-22 Fa. Andreas Stihl Schneidkopf für ein Pflanzenschneidgerät
US5036648A (en) * 1989-05-17 1991-08-06 Andreas Stihl Cutterhead for a vegetation cutter apparatus
US4989321A (en) * 1989-07-07 1991-02-05 Andreas Stihl Rotatably driven cutterhead for a vegetation cutting apparatus
US5063673A (en) * 1989-09-11 1991-11-12 Black & Decker Vegetation cutters
US5109607A (en) * 1990-10-12 1992-05-05 Inertia Dynamics Corporation Automatic line trimmer head
US5060384A (en) * 1990-12-06 1991-10-29 Inertia Dynamics Corporation Automatic head for a line trimmer
US5743019A (en) * 1995-06-07 1998-04-28 Berfield; Robert C. Rotary flail feeding device and method
US5675897A (en) * 1996-05-01 1997-10-14 Berfield; Robert C. Rotary flail feeding device
US5758424A (en) * 1996-08-23 1998-06-02 Iacona; Fernando R. Head for string trimmer
US5887348A (en) * 1996-08-23 1999-03-30 Iacona; Fernando R. Head for string trimmer
US5896666A (en) * 1996-08-23 1999-04-27 Iacona; Fernando R. Head for string trimmer
US6446345B1 (en) * 1998-11-24 2002-09-10 Starting Industrial Co., Ltd. Rotary cutter for mower
US7111403B2 (en) 1999-09-21 2006-09-26 Moore Mark R Head for line trimming apparatus
US6401344B1 (en) 1999-09-21 2002-06-11 Mark R. Moore Head for line trimming apparatus
US6347455B2 (en) 1999-12-20 2002-02-19 Murray, Inc. String trimmer head
EP1393611A1 (de) * 2002-08-26 2004-03-03 GARDENA Manufacturing GmbH Rotierender Schneidkopf, insbesondere für einen Rasentrimmer
US8061042B2 (en) * 2005-09-13 2011-11-22 Arnetoli Motor S.R.L. Mowing head with peripheral members for engagement of the cutting line
US7984555B2 (en) 2005-09-13 2011-07-26 Fabrizio Arnetoli Mower head with protection for a cutting cord
WO2007032043A1 (en) 2005-09-13 2007-03-22 Arnetoli Motor Mower head with protection for a cutting cord
US20080250653A1 (en) * 2005-09-13 2008-10-16 Fabrizio Arnetoli Mower Head With Protection for a Cutting Cord
US20070214655A1 (en) * 2005-09-13 2007-09-20 Fabrizio Arnetoli Mowing head with peripheral members for engagement of the cutting line
US20080282552A1 (en) * 2005-11-02 2008-11-20 Fabrizio Arnetoli Grass-Cutting Head with Spiral Guide Channels for the Cutting Line
US7966736B2 (en) 2005-11-02 2011-06-28 Arnetoli Motor Di Arnetoli Fabrizio Grass-cutting head with spiral guide channels for the cutting line
US7536792B2 (en) 2007-01-03 2009-05-26 Moore Mark R Head for a rotary line trimmer apparatus
US20080155837A1 (en) * 2007-01-03 2008-07-03 Moore Mark R Head for a rotary line trimmer apparatus
US20130283752A1 (en) * 2012-03-19 2013-10-31 Robert Bosch Gmbh Line trimmer
US10165727B2 (en) * 2015-02-16 2019-01-01 Tecomec S.R.L. Trimmer head
US20180271010A1 (en) * 2015-10-08 2018-09-27 Husqvarna Ab Automatic line feed for trimmer
US10918015B2 (en) * 2015-10-08 2021-02-16 Husqvarna Ab Automatic line feed for trimmer
US10034422B2 (en) 2016-06-14 2018-07-31 Black & Decker Inc. Cutting head for a string trimmer

Also Published As

Publication number Publication date
SE8505347L (sv) 1986-08-01
JPS61177914A (ja) 1986-08-09
FR2576743B1 (fr) 1990-02-02
AU5285386A (en) 1986-08-07
SE8505347D0 (sv) 1985-11-12
DE3503237A1 (de) 1986-08-07
GB2170389A (en) 1986-08-06
AU577006B2 (en) 1988-09-08
CA1263029A (en) 1989-11-21
JPH0640777B2 (ja) 1994-06-01
SE456631B (sv) 1988-10-24
GB2170389B (en) 1988-07-13
FR2576743A1 (fr) 1986-08-08
DE3503237C2 (de) 1993-09-16
GB8601932D0 (en) 1986-03-05

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